Dumbwaiter or other like door



Oct. 23, 1934. A. A. ALLEN DUMBWAITER OR OTHER LIKE DOOR Filed Feb. 20,k 1933 INVENTOR lai/ QL; ATTORNEY- Patented Oct. 23, 1934 UNITI-:o `STATI-:sl

DUMBWAITER 0R OTHER LIKE DOOR Arthur A. Allen, Bellerose, N. Y., assignor to The Peelle Company, Brooklyn, N. Y., a corporation of New York Y Application February 20, 1933, Serial No. 657,707

6 Claims.

My invention relates 4to dumbwaiter or other like doors, and more particularly to a door of this kind having a glazed observation opening therethrough.

Dumbwaiter doors of the type to which the invention relateshave, in one of the panels, an observation or sight opening closed by a light of fire retardant glass, such as wired glass. Such doors have a fairly thin sheet metal hollow panel g carried by an angle metal frame and filled with mineral wool or other fibrous non-combustible material. The general construction is similar to what is known as a Kalomine door. Since the observation opening is ordinarily circular, 1 the mounting of the light of glass used for closing the opening has always been a troublesome and expensive item in the production of the doors.

The space available in a shaft for the mounting of the door is limited and in many instances, thc regulations of local fire underwriters require the provision of interlocking iiame angles at the lintel and sill of the opening and at the top and the bottom of the door. The doors themselves are set so close to the wall having the door openy ing therein, that the use of such flame angles preclude the riveting of a frame for the observation glass to the face of the door presented toward the wall and projecting bolts and nuts upon the shaft side of the door are not permissible because of the likelihood of interference between Vthe dumbwaiter car and various doors in a shaft.

Furthermore, the sheet metal used in the door panels, or sections, with its filler of asbestos or other material, does not lend itself readily to the securing thereto of the frame for the light of glass.

With the above conditions in mind, I have provided a door of the character described wherein the frame for securing the light of glass in the observation opening, is composed of -two interlocking, annular sections, theV assembling of which in relation to each other holds the light of glass rmly in place in relation thereto and to the door panel, these two sections being secured in relation to the light of glass, to each other and to the door panel by ordinary machine screws having no parts projecting beyond the plane occupied by the outer face of each of said sections and having no engagement with the door section.

The two sections of the frame when united are of a thickness only slightly greater than that of the door panel itself and are drawn together sufciently tightly to develop suicient friction be- ,tween the anges of the frame and the sheet (Cl. IZ0-39) y l metal facing of the doors to avoidpossibility of rattling or of movement of theframe after it has once been mounted in the door.

A dumbwaiter door of the type to which my invention relates, and other types of Kalomine (3o. doors having observation lights therein, have heretofore been completely assembled in the shop and freighted to the building under construction. Breakage of glass during transportation and installation wasa frequent occurrence and the soiling of glass when finishing the doors after installation and when washing down the dumbwaiter shaft, were also a source of considerable annoyance and loss, since it involved the delays and expense incidental to furnishing new glass and moiuiting it in the door.

In a door in which the observation light is secured in the side opening by means of a sectional ring used in the practice of my invention, it is possible to mount the light of glass in the open- 75. ing after the installation of the door, thus permitting the shipment of said glass in a properly protected package. The construction of the sectional ring is such that the mounting of the glass requires merely the use of a small amountof 80, putty and a screw driver thus permitting the mason who installs the dumbwaiter door, or the erectors of the dumbwaiter car installation, toi mount the glass inthe door as the final operation of installing the dumbwaiter equipment..

The construction of a door embodying the invention also permits rapid and convenient repairs. in the event of ,accidental breakage of the light of glass while the dumbwaiter installation is in operation.

The invention consists primarily in `a dumbwaiter or other like doors embodying therein a hollow sheet metal panel having a sight opening` therethrough, a ring section having an outwardly directed iiange adapted to overlap the edge of said 95, opening and engage `one face of said panel and an inwardly directed shoulder forming a seat for a light of glass, a light of glass upon said seat,

a second ring section adapted to telescope within said first section and having an outwardly directed flange adapted to overlap theedge of said opening and engage the opposite face of the door panel and an inwardly directed shoulder adapted` to co-operate'with the other ring section in holding a light of glass within the ring, and means passing through one of said sections out` of engagement with the panel and acting upon a portion of the other of said sections within the opening in said panel to draw them together with the outwardly directed anges in frictional `engage- 11o sul ment with the door panel and the inwardly directed flanges in engaging relation with a light of glass and prevent relative movement of said sections; and in such other novel features of construction and combination of parts as are hereinafter set forth and described, and more particularly pointed out in the claims hereto appended.

Referring to the drawing,

Fig. 1 is a vertical section through a dumb-,

waiter door embodying the invention, parts thereof being broken away and the door vertically condensed; e

Fig. 2 is a view of the inner face of one of the ring sections;

Fig. 3 is a section on the line 3-3of Fig.. 2;.

Fig. 4 is a view of the inner face of the other ring section; and l Fig. 5 is a section on the line 5-5 of Fig. 4.

Like numerals refer to like parts throughout the several views.

In the embodiment of the invention shown in the drawing, the wall of the dumbwaiter shaft is shown at l0, the `dumbwaiter door itself being mounted within the dumbwaiter shaft close to said wall upon a suitable guide structure l1. Or dinarily these dumbwaiter doors are made in two vertically and oppositely slidable sections 12 and 13, the top of the upper section being provided with an angle metal fitting 14 adapted when the door is closed, to interlock with an angle metal fitting 15 at the lintel of the shaft opening 16. The lower door section-at the bottom thereof has an angle metalk tting 17 adapted to interlock with an angle metal fitting 18 at the sill of the opening in the same manner as the fitting 14 at the lintel interlocks with the fitting 15.

The manner of mounting and connecting the twodoor sections is immaterial to the present invention, which resides in the 'structural details of one of the door sections for the ypurpose of permitting the attendant to observe conditions within the shaft, from the floor side thereof.

Doors of the type to which the invention relates are of very light weight and ordinarily are only of approximately an inch in thickness. Each door section has an angular frame 19 of channel metal for the support of a panel consisting of parallel thin sheet metal plates 20 and 21 spaced apart so as to provide a hollow panel having a ller 22 of asbestos or other fibrous material, as distinguished from the boards commonly used/in the production of freight elevator doors.

The panel of the upper door section 12 is provided with a circular opening therethrough, the plates 20 and 21 being cut away at 23 and 24 respectively to form this opening. A light of glass 25 is used to close the opening, a wired glass ordinarily being employed to make the section fire retardant throughout. l

Because of the thinness of the sheet metal stock used for the plates 20 and 21, and of the absence of a rigid backing for these plates, and because of the presence of the fibrous filler 22 about the edge of the opening, the mounting of the glass 25 within 'the opening presents serious manufacturing problems not present with other types of doors, since with the latter, practices well known to workers in the art of producing Vmetal building supplies, can be used when mounting the glass in thesight opening.

In `conjunction with a door section constructed as above, I provide means for supporting alight of glass'25 within the opening `through kthe door,v4 which consists jof a ring section`26, the outsideA diameter of which is submanually that of the Asection 26 and the light of glass 25 in a manner to openings 23 and 24, this ring being of a width slightly less than the thickness of the door, and having an outwardly directed flange 27 adapted to overlap the edge of the said opening in and to engage the adjacent plate 20 forming one face of the panel. Said ring is also provided with an inwardly directed shoulder 28 forming a continuous seat for the light of glass 25. A channel 29 extends about the inside of the ring 26 toward the edge thereof opposite the flange 27. The outerwall 30 of this channel is interrupted at a plurality of points 31, 32, 33 and 34 for the purpose of facilitating the mounting of a co-operating telescoping ring section in relation to the to be hereinafter referred to.

Cov-operating with the ring section 26 is a second ring section 35 of smaller diameter, than the ringsection 26 so as to be capable of telescoping within said other lring.` This ring section 35,is of a width'less than that of the section 26, since it is not relied upon to close the space between the plates20 and 21 for the purpose of preventing the escape of the panel ller 22, the space between the plates 20 and 21 in the opening being closed by the ring 26.

Said ring 35 is provided with an outwardly directed flange 36 of a depth to project across the end of the ring 26, overlap the edge of theopeng ing 24 in the plate 21 and engage'the face of the panel 'opposite to that engaged by the flange 27.

The ring 35 is also provided with an inwardly directed shoulder 37 at the edge of the ring op-` posite that from which ythe flange 36 projects, saidshoulder 37 co-operating with the inwardly directed shoulder 28 of the ring section 26 ink confining the light of glass 25 within the Aopening through the door panel.

The ring 35 adjacent the edge thereof from which the shoulder 37 projects is provided with a plurality of outwardly directed lugs 38, 39, 40 and 41 whichA are of a length and are so spaced as to pass` respectively through the cut away portions 31 to 34 at one edge of the ring 26, and have a sliding fit within the channel 29 sothat they can be moved to a position where they will pass under and engage the outer wall 30 of said channel.

The edge `of the ring 26 adjacent the channel 125 29 is drilled and tapped as shown at 42 for the reception of ordinary machine screws 43 passing through countersunk openings 44 in the flange 36 of the ring-section 35.

The lighty of glass 25 is slightly smaller in di- 130 ameter than the inner diameter 0f the ring 26 so as to permit the use of sealing material 45 such as putty or heavy paper about the edge of the glass and between it and the flanges and the adjacent portions ofthe rings 26 or l35.

In the structure of the invention, after the hollow panel has been filled with the mineral wool or other material 22, the ring 26 is mounted in the opening through the door by passing it through theopening 23 in the side plate 20 until 140 the'fiange 27 of thisring engages the face of the panel about said opening as shown in Fig. 1, thus closing the edge of the opening and confining the filler 22 within the panel. The ring 35 is then so positioned as to aline the several lugs 38, 39, 40 145 and 41 with the openings `31, y32, 33 and 34 respectively, and telescoped Within'the other ring section 26 lto" an "extent to permit-said sections to have rotative xmovement to bring the lugsbefv neath the Side Wall of ythe channel between the 150 rotary movement of the two sections.

Larmesy cut away portions thereof and to register the countersunk openings 44 with the screw threaded openings 42.

If the light of glass is to be assembled in the door section structure before shipment, the glass 25 is first located in relation to the shoulder 28 and a packing of putty, heavy paper or cardboard is laid between said shoulder and said light of glass and may extend about the edge of the glass. A similar packing is laid between the light of glass and the shoulder 37. If desired, heavy disks of paper may be used so as to completely cover both sides of the glass, thus protecting it from dust and dirt during shipment, during the installation of the doors in the elevator shaft and during the subsequent finishing of the doors and the shaft. When such paper is used, it is merely necessary to cut away the portion of the disks within the ring about the shoulders 28 and 37 thus exposing the glass. This, however, is a mere matter of practice.

After the glass 25 has been mounted within the ring in the manner described, the screws 43 are used to draw the two ring sections together to 25" increase the frictional engagement between the light of glass and the shoulders 28 and 37, and the flanges 27 and 36 and the face plates 20 and 21, these plates about the opening yielding slightly.

The assembling of the two ring sections requires merely the use of a screw driver. v

If desired, the two ring sections may be assembled in relation to the door panel without the light of glass being in position and the glass lvmay be quickly mounted in the door section after the installation of the door, by merely removing the ring section 35 and mounting the glass in the manner above described. Ihis practice is preferable since it permits the shipment of the lights of glass in a separate, properly protected container, thus avoiding likelihood of breakage of the glass during transportation from the factory to the point of installation. If the light of glass at any time, should be accidentally broken, it may be quickly replaced without the services of an expert glazier.

Only a slight turning movement of the ring 35,

approximately an inch and a half is required to locate the tongues 38 to 41 under the intact portions of the wall of the channel so as to prevent the separation of the two ring sections even in the event of the breakage of the screws 43.

In addition to drawing the two ring sections together, such screws serve to prevent relative the lugs in themselves will with the outer channel wall, afford such frictional contact between the two sections and between the flanges of each section and the door panel as will tend to hold the i two sections against accidental displacement.

Each ring section 26-35 may be cast in a single piece with suiiciently accurate dimensions to require practically no finishing excepting as to those portions thereof exposed at one side of the door,

i which may be ground and plated or otherwise finished to correspond with the general finish of the door section.

It will be noted that the only portions of the mount for the light of glass which project beyond either face of the panel are the overlaying ilanges 27 and 36. These flanges in actual practice are only an eighth of an inch in thickness, and the slight yielding of the plates 20 and 2l may reduce 4the extent of projection of the rings beyond the 'faces of the panels to less than one-eighth of an In fact,

inch. -The light of glass 25 may be heavy plate glass, one-fourth of an inch or so in thickness, but since this glass is located by the two ringr sections well within the opening of the door panel, the thickness of the glass is no factor so far as keeping the total thickness of the door within certain limits, is concerned. However closelyl adoor may be mounted in relation to the wall of a shaft, there is always sufficient clearance to accommodate the overlaying flange 27 and avoid any possible interference between this flange and the lintel or sill hooks 15 or 18. There is always. suilicient clearance between the dumbwaiter car` and the door to receive the flange 36.

In a door structure embodying the invention, the close fitting of the ring section 26 within the opening through the door panel and the attachment of the ring section 35 thereto in the manner described, permits the attachment of these ring sections and the light of glass within the opening` without the aid of rivets or screws passing through the facing plates 20 and 2l. Hence, there is noy weakening of these plates about the opening, the presence of the overlaying iianges of the two ring sections and the support of the ring section 26 by the edge of the metal plates about the opening, reinforcing these plates. At the same time, the. avoidance of rivets and screws passing through the two plates and engaging the two rsections avoids parts protruding from the overlaying flanges 27 and 36 and permits the convenient rey moval of the ring section 35 for the purpose of: mounting or replacing a light of glass in the door section.

It is not my intention to limit the invention to the precise details of construction shown in the accompanying drawing, it being apparent that such may be varied without departing from the spirit and scope of the invention.

Having described the invention what I Claim as new and desire to have protected by Letters Patent, is:-

1. A dumbwaiter or other like doors embodying therein a hollow sheet metal panel having a sight` opening therethrough, a ring section having `an outwardly directed ange adapted to overlap theY edge of said opening and engage one face of said panel and an inwardly directed shoulder formingvv a seat for a light of glass, a light of glass upon said seat, a second ring section adapted to telescope within said first section and having an outwardly directed flange adapted to overlap the; edge of said opening and engage the opposite face of the door panel and an inwardly directed shoulder adapted to co-operate with the other. ring section in holding a light of glass within the ring, i and means passing through one of said sections out of engagement with the panel and acting `upon a portion of the other of said sections within the opening in said panel to draw them together with the outwardly directed flanges in frictional engagement with the door panel and the inwardly directed flanges in engaging relation with a lightv of glass and prevent relative movement of said" sections.

2. A dumbwaiter or other like doors embodying therein a hollow sheet metal panel having a sight.' opening therethrough, a ring section having ari: outwardly directed flange adapted to overlap the edge of said opening and engage one face of said panel and an inwardly directed shoulder forming a seat fo-r a light of glass, said ring section having a screw threaded opening in the edge thereof remote from said outwardly directed flange and within the opening in said panel, a light of glass Mil upon said seat, a second ring section adapted to telescope withinv said first section and having an outwardly directed flange adapted. to overlap the edge of said opening and engage the opposite face of the door panel and an inwardly directed shoulder adapted to cio-operate with the other ring section in holding a light of glass within the ring, said outwardly directed iiange having an opening therethrough adapted to he registered with the screw threaded opening in said other ring section, and a screw within the opening in said panel and passing through said opening and engaging said screw threads, whereby said sections are drawn together with the outwardly directed iianges in frictional engagement with the door panel and the inwardly directed flanges in engaging rela-- tion with a light of glass and relative movement of said sections is prevented.

3. A dumbwaiter or other like doors embodying therein a hollow sheet metal panel having a sight opening therethrough, va ring section having an outwardly directed flange adapted to overlap the edge of said opening and engage one race of said panel and an inwardly directed shoulder forming a seat for a light of glass, said ring section lia-ving a channel within and extending about same adjacent the edge thereof opposite said outwardly directed flange, portions of the side of said chan,- nel at the edge of said ring being cut away, a

Ylight of glass upon said seat, a second ring section adapted to telescope within said first section and having an outwardly directed flange adapted :to overlap the edge of said opening and engage the opposite face of the door panel, an inwardly directed shoulder `adapted to `co-operate with the other ring section in holding a light of glass within the ring and exterior lugs adapted to pas through the openings in the edge oi said other `ring section and enter said channel beneath the intact portion oi the channel wall, and means acting upon both of said sections to draw them together with the outwardly directed flange-sin frictional engagement with the door panel and the inwardly directed iianges iii-engaging relation with a light of glass and prevent relative movement or" said sections.

4. Aldumbwaiter or other like doors embodying therein a hollow sheet metal panel having a sight opening therethrough, a ring section having an outwardly directed ila-nge `adapted. to overlap ther edge of said opening and engage one 'face of said,

panel and an inwardly `directed shoulder forming a. seat for a light of glass, said ring section havingascrew threaded opening in the ledge thererof remote from said outwardly directed flange and a channel within and extending about same `adjacent said edge, portions oi the side oi sai-d channelat the edge of said ring being cut away a light of glass upon said seat, a second ring sectionadapted to telescope within said first section and. having an outwardly directed harige adaptedv to overlap the edge of said opening and engage the opposite fac-e of the door panel, an inwardly directed shoulder adapted to co-operate with the other ring section in holding a light of glass within the ring and exterior lugs adapted to pass through the openings in the edge of said other ring section and enter said channel beneath the.

intact portion of the channel wall, anda. screwv` passing through said opening and engaging said. screw threads, whereby said sections are drawn together with the outwardly directed'ilanges in frictionaly engagement with the door panel and the inwardly directed ilanges in engaging relation with Ia Ilight of glass and relative vmovement of. said sections is prevented.

5, A dumbwaiter or other like -doors embodying therein a panel comprising a metal framaspaced sheet metal plates upon.v opposite sides oi said frame, and a brous ller within the s-pacebetween said plates, said plates having alined openings therethrough, a ring section of a width -to spanl the space between said side plates having an outwardly directed flange adapted to overlap the edge of said opening and. engage one of said plates and lan inwardly directedv shoulder forming a seat for `a light of glass, a light of glass upon saidy seat, a secon-d ring section adapted to telescope within said first section and having an outwardly directed iiangevadapted to overlap the edge of said opening and engage 4the other vand means acting upon both of said sections tov draw `them together with the outwardly directed iianges in frictional engagement with said plates respectively and the inwardly directed flanges in engaging relation with a light of glass and prevent relative movement of said sections.

5; Avdumbwaiter or other like doors embodying thereina panel comprising a metal frame, spaced sheet metal plates upon opposite sides of said frame and a fibrous iiller within the space between said plates, said plates having alined openings therethrough, a ring section of a width to span the space between said side plates having an outwardly directed flange adapted to overlap the edge of said opening andengage one of said plates and an inwardly directed shoulder forming a seat for a light of glass, said ring section having a screw .threaded opening in the edge thereof `remote from said outwardly directed flange and a channel within and extending about same adjacent said ledge, portions of the side of said channelI at the edge of said ring being cut away, a light of glass upon said seat, a second ring section .adapted to telescope within said rst se tion and having an outwardly directed flange adapted to overlap the edge of said opening and engage the other of said plates, an inwardly directed shoulder adapted to co-operate with the other ring section in holding .a light of glass within the ring and exterior lugs adapted to pass through the openings in the edgev of said other ring section and enter said channel beneath the int-act portion of the channel wall, and a screw passing through lsaid opening and engaging said se-rew threads, whereby said sections are drawn together with the outwardly directed flanges in friotional engagement with said plates respectively andthe inwardly directed flanges in enmovement of said sections is prevented.

ARTHUR A. ALLEN. 

